Exercise: Power Electronics

Questions for: Power Electronics

A single phase full converter can operate in
A:
4 quadrants
B:
3 quadrants
C:
2 quadrants
D:
1 quadrant
Answer: C
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In a 3 phase bridge inverter with 180° mode of operation the numbers of thyristors conducting at one time are
A:
1
B:
2
C:
3
D:
4
Answer: C
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A relaxation oscillator uses
A:
tunnel diode
B:
UJT
C:
both tunnel diode and UJT
D:
PIN diode
Answer: B
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A separately excited dc motor is run from a dc source through a chopper. At 600 rpm and rated torque, the duty cycle of chopper is 0.8. At 600 rpm and half the rated torque, the duty cycle is likely to be
A:
0.9
B:
0.8
C:
0.75
D:
0.6
Answer: C
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In a single phase full wave regulator feeding an R-L load, the power factor angle of load is θ. The range of control of firing angle a is
A:
0 ≤ a ≤ p
B:
θ ≤ a ≤ p
C:
0 ≤ a ≤ (p - θ)
D:
θ ≤ a ≤ (p + θ)
Answer: B
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